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Gorman-Rupp Pumps 86A2-F4L 1242877 thru 1322537 User Manual

Page 19

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OM--00957

80 SERIES

TROUBLESHOOTING

PAGE D -- 2

Table 1. Trouble Shooting Chart (cont.)

TROUBLE

POSSIBLE CAUSE

PROBABLE REMEDY

PUMP STOPS OR FAILS

TO

DELIVER

RATED

FLOW OR PRESSURE

(cont.)

Leaking or worn seal or pump gas-

ket.

Suction intake not submerged at

proper level or sump too small.

Strainer clogged.

Impeller or other wearing parts worn

or damaged.

Impeller clogged.

Suction lift or discharge head too

high.

Pump speed too slow.

Check pump vacuum. Replace leak-

ing or worn seal or gasket.

Check installation and correct sub-

mergence as needed.

Check strainer and clean if neces-

sary.

Replace worn or damaged parts.

Check that impeller is properly cen-

tered and rotates freely.

Free impeller of debris.

Check piping installation and install

bypass line if needed. See

INSTAL-

LATION.

Check engine output; consult engine

operation manual.

PUMP REQUIRES TOO

MUCH POWER

Pump speed too high.

Discharge head too low.

Liquid solution too thick.

Bearing(s) frozen.

Check engine output.

Adjust discharge valve.

Dilute if possible.

Disassemble pump and check bear-

ing(s).

PUMP CLOGS

FREQUENTLY

Discharge flow too slow.

Suction check valve or foot valve

clogged or binding.

Discharge line clogged or restricted;

hose kinked.

Open discharge valve fully to in-

crease flow rate, and run engine at

maximum governed speed.

Clean valve.

Check discharge lines; straighten

hose.

EXCESSIVE NOISE

Cavitation in pump.

Pumping entrained air.

Pump or drive not securely mounted.

Impeller clogged or damaged.

Reduce suction lift and/or friction

losses in suction line. Record vacu-

um and pressure gauge readings

and consult local representative or

factory.

Locate and eliminate source of air

bubble.

Secure mounting hardware.

Clean out debris; replace damaged

parts.